Heavyweight Flannel Sheet Set - Snowflake ~ KING Get festive with the Holiday Flannel Sheets. Not only does this sheet set feature great prints that celebrate the holiday season, they're also made of super soft and cozy flannel. Imagine sinking into a smooth and toasty bed after a long, hard day. SIZE: KING Made of 100% cotton, these sheets will become an instant portal to a good night's sleep. Machine wash in warm, tumble dry.